HomeMy WebLinkAbout122 - 10/16/1979 - AMENDING SECTIONS 1305 AND 1405 OF THE UNIFORM BUILDING CODE INSOFAR AS IT RELATES TO LIGHT AND VENT or
ORDINANCE NO 122 , 1979
BEING AN GRDINANCE AMEN Tf,6 SECTI 6 1305 AND 1405
OF THE UNIFOPfj BUILDIi G CODE INSOFAR
AS IT RELATES TO LIGHT AiVD VEUTILATI01'
BE IT OPDAINED SuY THE COUNCIL OF THE CITY OF hORT COLLINS as follows
Section 1 That Section 1305 ( d) of the Lniforrr Building Code, 1976
Edition be, and it hereby is, amenaeo to read as follows
61305 ( d) Liaht ano Ventilation All guest rooms, dormitories
and habitable rooms vithin a dwel lino unit snall be
provided with natural light by means of exterior
glazed openings with an area not less than one-
tr,entieth of the floor area of such roums with a
minimum of 5 saUare feet All bathrooms , water
closet coipartnents, laundry rooms and similar rooms
shall be proviaed with natural ventilation by
means of openable exterior ooennngs with an area not
less than one-twentieth of tyre fluor area of sucrr
rooms v,i th a minimum of 1-1/L square feet
EXCEPTION Artificial lignt may be Substituted for
natu al light for all habitablt- rooms in baser-eats
other toan sleeping roams pro�ioed sich rooms ao not
constitute a basement drellino u^ ,t
All auPst rooms, dormitories, and habitaole roopis
vithin a c�,elling unit shall r)e prcv , ded vith
natural ventilation bti means of openable exterior
openings 14itn an area of not less thar one-fort7Etn
of the floor area of sr ,cr, r oor,,s v i th a mi nipurr of
2-112 Square feet
EXCEPTIONd The area of ouenable exterior openings
for the purpose of natural ventilation iaay be
aecreasPd to one percent (1%) of The floor area for
all habitable rooms with exterior walls in base-
ments, other than sleeping rooms provioed such
rooms do not constiL.rte a basement or,elling unit
In lieu of required exterior oheninas for natural
1ent11 ,t1cr a ntchroical v2nfil °tiro system r -y be
providca ,LActi systei snap be capable of provid-
ing tro air cnanaEs per hour it all guest rocris,
dormitories, habitable rooms, and in public corri-
dors One-fifth of the air supply shall be taken
from the outside In batnrooms, �>ater closet
compartments, laundry rooms, and similar rooms a
mechanical ventilation systew connected directly to
the outside, capable of providing five air changes
per hour, shall be provided
For the purpose of determining light and ventilation
requirements, any room may be considered as a
portion of ar adjoining room when one-half of the
area of the comrron wall is open and unobstructed and
provides an ouening of not less than one-tenth of
the floor area of the interior room or 25 square
feet, whichever is greater
required exterior openings for natural light and
ventilation shall open directly onto a street or
public alley or a yard or court located on the same
lot as the building
EXCEPTION Reauired 1n noows may open into a roofed
porcn where the porch
1 ) Abuts a street, yard, or court, and
2 ) Has a ceilinq height of not less than 7 feet,
and
3) Has the longer site at least sixty-five percent
(650) open and unobstructed "
Section 2 That Section 1405 ( a) of the Uniform Building Code, 1976
Edition, be, anq it nere,)y is, amEnded to read a� follo,vs
"91405 ( 2) Light and Ventilation All guest rooms, dormi-
tories, and habitable rooms within a dwelling unit
shall be provided with natural light by means of
exterior glazed openings with an area not less than
one-te4entietn of the floor area of such rooms
with a minirlum of 5 square feet All bathrooars,
writ �r closet coiip,,rtiien t s, 1 dunury r oorlis and s i rri 1 a-
roo^gs shall be provided with natural ventilation by
means of operable exterior openings with an area not
i _ 1 r -i' c f t l 't ,f Lr f 1 _ ) )r2ct of SU(_h
rooms with a m1rnurui or 1-1/2 square feet
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EXCEPTIOU Artificial light may be substituted for
natural light far all habitable rooms in basements
other than sleeping rooms provided such rooms do not
constitute a basement owelling unit
All Guest rooms, dormitories, and habitable rooms
within a dvelIina unit shall be provided with
natural ventilation by means of openable exterior
openings with an a-ea of not less than one-twentieth
of the flnor area of such rooms with a minimum
of 5 square feet
EXCEPTION The area of openable exterior openings
for the purpose of natural ventilation may be
decreased to one percent (1%) of the floor area for
all habitable rooms with exterior walls in base-
ments , other than sleeping rooms provided such
rooms do not constitute a basement owellina unit
In lieu of requirea exterior openings for natural
ventilation, a mechanical ventilating system may be
providea Such system shall oe capable of provioing
two air changes per rout in all guest rooms ,
dormitories, habitable roots, and in public corri-
dors Ope-fifth of the air supply shall be taken
froii, the outside In bathrooms , water closet
coipartments, laundry rooms, and similar rooms a
mechanical ventilation syster connected directly to
the outside, capable of providing five air changes
per hour, shall be provided
For the purpose of determining light and ventilation
reouirements, any roor, may be considered as a
portion of an adjoining room Shen one-half of the
area of the common vall is open and unobstructed
and provides an opening of not less than one-tenth
of the floor area of the interior room or 25 square
feet, whicnever is greater
Pequired exterior openings for natural light and
ventilation shall open directly onto a street or
public ally, or a yard or coq-t located on the sa^e
lot as the bulluing
-XCEPi YK Arc lrE 11 �i s pia, ope, into a _l �'Pd
porch me, e the porun
1 ) Abuts a street, yard, or court, and
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2 ) Has a ceiling height of not less than 7 feet,
and
3) Has the longer side at least sixtk-five percent
(65'/D) open and unobstructed "
Introduceo , considered favorabl3 on first reading , and ordered
published this 2nd day of October , A D 1979, and to be presented
for final passage on the 16th day of October 4 D 1979
� A
Mayor
AT ST
C y
Passed and adopted on final reading_ this 16th day of October ,
A D 1979
�— M a r '
A�ST
City Clerk
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